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Proceedings Paper

High-speed photography applied to the laser-cladding process
Author(s): Fabrice Meriaudeau; Frederic Truchetet; Christophe Dumont
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Paper Abstract

The laser cladding process consists in adding melting powder to a metallic substrate. The process usually involves the delivery of fine grained alloy powder blown into the melt pool during the laser irradiation. The temperature of the grains when they reach the surface and their speed within the laser beam are extremely correlated and influence on the quality of the coating. We present three methods which can be used to measure the speed of the particles in the powder stream; they all make use of digital images obtained with a standard matrix CCD camera and a strobed lighting. The first method, which we call the basic one, allows speed measurements in a slim cross section of the powder stream. Thanks to its low requirement in calculation amount we were able to implement it in a strictly software design for real time application (1 image/20 ms). In the second method we work on the Fourier transform plan of a strobed image, between two flashes the particles have moved from the same distance this periodic distance represents a specific frequency which is estimated in the Fourier space. In the third method, we strobe the image using three color filters and obtain a RGB image. The autocorrelation function of the image provides us with information related to the speed of the particle. The particularity of the two last methods is their complementarity. Indeed, the FFT gives good and averaged results for wide area, it is a large scale method. At the opposite, the three colors imaging method is powerful for small scale study.

Paper Details

Date Published: 28 May 1997
PDF: 10 pages
Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); doi: 10.1117/12.273390
Show Author Affiliations
Fabrice Meriaudeau, Univ. de Bourgogne (France)
Frederic Truchetet, Univ. de Bourgogne (France)
Christophe Dumont, Univ. de Bourgogne (France)


Published in SPIE Proceedings Vol. 2869:
22nd International Congress on High-Speed Photography and Photonics
Dennis L. Paisley; ALan M. Frank, Editor(s)

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